Rolex: A rare steel Oyster speedking free-sprung wristwatch with Kew A certificate, in typical Oyster case, the white dial with alternating Arabic and baton numerals, subsidiary seconds signed by the makers and inscribed "Kew A certificate", the case with screw-down winder and screwed back with makers mark numbered 5056, the signed pink gilt movement with special steel cock and ruby end-stone engraved Time with screws on balance, free-sprung blued steel hairspring, split monometalic balance and numbered 4167, jewelled to the centre with screwed jewel holder for the scape wheel, also inscribed Kew A tested

Details

Rolex: A rare steel Oyster speedking free-sprung wristwatch with Kew A certificate, in typical Oyster case, the white dial with alternating Arabic and baton numerals, subsidiary seconds signed by the makers and inscribed "Kew A certificate", the case with screw-down winder and screwed back with makers mark numbered 5056, the signed pink gilt movement with special steel cock and ruby end-stone engraved Time with screws on balance, free-sprung blued steel hairspring, split monometalic balance and numbered 4167, jewelled to the centre with screwed jewel holder for the scape wheel, also inscribed Kew A tested
29mm.diam., movement 24mm.diam.

Lot Essay

According to records of Kew trials held at that time, a number of special movements with a diameter of 23.7mm. and with movement numbers in the series 4100 to 4200 were tested at Kew between the years 1948 and 1950. All these movements were described as having Guillaume balances. Other manufacturers represented in these tests were Vacheron Constantin, Omega, Longines and Charles Aerni of Le Locle.

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